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[Qemu-devel] [PATCH 6/6] virtio-9p: Implemented Security model for lstat
From: |
Venkateswararao Jujjuri (JV) |
Subject: |
[Qemu-devel] [PATCH 6/6] virtio-9p: Implemented Security model for lstat and fstat |
Date: |
Mon, 10 May 2010 13:24:04 -0700 |
Signed-off-by: Venkateswararao Jujjuri <address@hidden>
---
hw/virtio-9p-local.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 63 insertions(+), 4 deletions(-)
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 89b17f0..529de73 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -27,9 +27,40 @@ static const char *rpath(FsContext *ctx, const char *path)
return buffer;
}
-static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf)
+
+static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
{
- return lstat(rpath(ctx, path), stbuf);
+ int err;
+ err = lstat(rpath(fs_ctx, path), stbuf);
+ if (err) {
+ return err;
+ }
+ if (fs_ctx->fs_sm == sm_mapped) {
+ /* Actual credentials are part of extended attrs */
+ uid_t tmp_uid;
+ gid_t tmp_gid;
+ mode_t tmp_mode;
+ dev_t tmp_dev;
+ if (getxattr(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid,
+ sizeof(uid_t)) > 0) {
+ stbuf->st_uid = tmp_uid;
+ }
+ if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
+ sizeof(gid_t)) > 0) {
+ stbuf->st_gid = tmp_gid;
+ }
+ if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode,
+ sizeof(mode_t)) > 0) {
+ stbuf->st_mode = tmp_mode;
+ }
+ if (S_ISCHR(tmp_mode) || S_ISCHR(tmp_mode)) {
+ if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
+ sizeof(dev_t)) > 0) {
+ stbuf->st_rdev = tmp_dev;
+ }
+ }
+ }
+ return err;
}
static void local_set_cred(FsCred *credp)
@@ -200,9 +231,37 @@ static int local_mkdir(FsContext *fs_ctx, const char
*path, FsCred *credp)
return err;
}
-static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf)
+static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf)
{
- return fstat(fd, stbuf);
+ int err;
+ err = fstat(fd, stbuf);
+ if (err) {
+ return err;
+ }
+ if (fs_ctx->fs_sm == sm_mapped) {
+ /* Actual credentials are part of extended attrs */
+ uid_t tmp_uid;
+ gid_t tmp_gid;
+ mode_t tmp_mode;
+ dev_t tmp_dev;
+
+ if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
+ stbuf->st_uid = tmp_uid;
+ }
+ if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
+ stbuf->st_gid = tmp_gid;
+ }
+ if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
+ stbuf->st_mode = tmp_mode;
+ }
+ if (S_ISCHR(tmp_mode) || S_ISCHR(tmp_mode)) {
+ if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev,
+ sizeof(dev_t)) > 0) {
+ stbuf->st_rdev = tmp_dev;
+ }
+ }
+ }
+ return err;
}
static int local_open2(FsContext *fs_ctx, const char *path, int flags,
--
1.6.5.2
- [Qemu-devel] [PATCH 0/6] virtio-9p:Introducing security model for VirtFS, Venkateswararao Jujjuri (JV), 2010/05/10
- [Qemu-devel] [PATCH 1/6] virtio-9p: Introduces an option to specify the security model., Venkateswararao Jujjuri (JV), 2010/05/10
- [Qemu-devel] [PATCH 6/6] virtio-9p: Implemented Security model for lstat and fstat,
Venkateswararao Jujjuri (JV) <=
- [Qemu-devel] [PATCH 3/6] virtio-9p: modify create/open2 and mkdir for new security model., Venkateswararao Jujjuri (JV), 2010/05/10
- [Qemu-devel] [PATCH 4/6] virtio-9p: Implement Security model for mknod related files, Venkateswararao Jujjuri (JV), 2010/05/10
- [Qemu-devel] [PATCH 5/6] virtio-9p: Implemented security model for symlink and link., Venkateswararao Jujjuri (JV), 2010/05/10
- [Qemu-devel] [PATCH 2/6] virtio-9p: Rearrange fileop structures, Venkateswararao Jujjuri (JV), 2010/05/10